File Sharing using DFS

i set up DFS and need to solve this problem in FRS? i need to be able to do what microsoft can't.

User A and User B open the same 100-page document on different replicas.
User A adds 100 pages and saves the document first;
user B deletes 80 pages and then saves the document.
The 20-page document that was saved last becomes the authoritative file.
FRS cannot deny file sharing or enforce file locking between two users who are writing to the same file on two different replicas

i need a software program that will prevent the second file from being edited.

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